Classifications

• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B62/00—Reactive dyes, i.e. dyes which form covalent bonds with the substrates or which polymerise with themselves
  • C09B62/44—Reactive dyes, i.e. dyes which form covalent bonds with the substrates or which polymerise with themselves with the reactive group not directly attached to a heterocyclic ring
  • C09B62/503—Reactive dyes, i.e. dyes which form covalent bonds with the substrates or which polymerise with themselves with the reactive group not directly attached to a heterocyclic ring the reactive group being an esterified or non-esterified hydroxyalkyl sulfonyl or mercaptoalkyl sulfonyl group, a quaternised or non-quaternised aminoalkyl sulfonyl group, a heterylmercapto alkyl sulfonyl group, a vinyl sulfonyl or a substituted vinyl sulfonyl group, or a thiophene-dioxide group
  • C09B62/507—Azo dyes
  • C09B62/515—Metal complex azo dyes

Definitions

• the present invention relates to the field of water-soluble acid textile dyes, in particular when used as fiber-reactive dyes.
• Two azo dyes are already known from Table Examples 26 and 27 of German Offenlegungsschrift 2,344,333, which contain a 2-aminonaphthalene disulfonic acid as the coupling component and the 4- ⁇ -sulfatoethylsulfonyl-2-methoxy-5-chloro-aniline as the diazo component.
• These known dyes show certain defects, such as unsatisfactory lightfastness of their synthetic resin-colored dyeings on cellulose fibers.
• a copper complex monoazo dye is described in French Patent Application Publication No. 2 360 571 in Example 8, the diazo component of which is 5- ⁇ -sulfatoethylsulfonyl-2-aminophenol and the coupling component of which is 1-amino-8-naphthol-4,6- is disulfonic acid; this known copper complex dye shows low perspiration and hypochlorite bleaching fastness properties.
• a chlorine-substituted diazo component namely 5- ⁇ -sulfatoethylsulfonyl-4-chloro-2-aminophenol, is further described in Example 4.
• the present invention accordingly relates to valuable water-soluble copper complex azo compounds of water-soluble metal-free mono- and disazo compounds of the general formula (1) given and defined below, and to these metal-free water-soluble mono- and disazo compounds of the general formula (1) itself:
• Alkaline eliminable groups are, for example, halogen atoms, such as the chlorine and bromine atom, ester groups of organic carboxylic and sulfonic acids, such as a lower alkanoyloxy radical, for example the acetyloxy radical, or the sulfobenzoyloxy, benzoyloxy, benzenesulfonyloxy or toluenesulfonyloxy radical, and furthermore, for example, the acidic ester groups of the Phosphoric acid or sulfuric acid according to the formulas, written in the form of the free acids, -OP0 3 H 2 or -OS0 3 H, or the rest of the thiosulfuric acid of the formula, written in the form of the free acid, -S-S0 3 H, likewise Dialkylamino groups with alkyl groups of 1 to 4 carbon atoms, such as the dimethylamino and diethylamino group, and the hydroxyl group.
• D represents the phenyl or naphthyl radical which is substituted by 1, 2 or 3 substituents from the group chlorine, bromine, alkyl of 1 to 4 carbon atoms, such as methyl and ethyl, alkoxy of 1 to 4 carbon atoms, such as methoxy and ethoxy, hydroxy, sulfo, carboxy, carbamoyl and sulfamoyl, preferably chlorine, methyl, methoxy, sulfo and hydroxy, and may also be substituted by a radical corresponding to the formula element X defined above , and Y as a group complex-binding the copper atom represents the rest of the formula -O-or -NH-.
• K is the remainder of a coupling component from the naphthol series or from the acylaminonaphthol series or from the pyrazolone series, it preferably represents the remainder of 1-naphthol or 2-naphthol, which are substituted by 1, 2 or 3 sulfo groups, or the remainder of 1-naphthol or 2-naphthol which are substituted by 1 or 2 sulfonic acid groups and by an acetylamino, propionylamino, benzoylamino, benzenesulfonylamino or tosylamino group or the rest of the 1-phenyl-5-pyrazolone, which is substituted in the 3-position by the methyl, carbomethoxy, carbäthoxy or the carboxy group and whose 1 permanent phenyl radical can be substituted by 1 or 2 substituents from the group chlorine, methyl and sulfo.
• the compounds according to the invention can be present both in the form of the free acid and in the form of their salts.
• Preferred are in the form of the salts, in particular the alkali and alkaline earth metal salts, of which in particular the sodium, potassium and also calcium salts.
• the new compounds are preferably used in the form of the alkali metal salts for dyeing and printing fiber materials and leather.
• the present invention further relates to processes for the preparation of the compounds of the general formula (1) and their copper complexes, in particular of the general formulas (4).
• the compounds of general formula (1) are prepared by using an aromatic amine of general formula (5) in which R and X have the meanings given above, diazotized in a conventional manner and with a monovalent or bivalent coupling component of the general formula (6) or (6a) in which K has the meaning given above, couples once or twice.
• the coupling with the first mole of the diazonium compound of the amine of the general formula (5) or another aromatic amine of the aniline or naphthylamine series can first be carried out to produce a diazo compound, preferably an amine of the general formula (7) with D of the meaning given above, in the acidic medium and then the second coupling reaction with the second mole of a diazonium compound of an amine of the general formula (5) or an amine of the aniline or naphthylamine series, preferably an amine of the general formula (7), however mandatory with the diazonium compound of the amine of the general formula (5), provided that the first coupling reaction with the diazonium compound of an amine from the aniline or naphthylamine series, preferably an amine of the general formula (7), has been carried out in the weakly acidic, neutral or weakly alkaline range take place, for example if the coupling component of
• esterification and acylating agents are, for example, organic or inorganic acids and their anhydrides or halides and amides of such acids, for example sulfuric acid, phosphoric acid, acetic anhydride, toluenesulfonyl chloride, thionyl chloride, amidosulfonic acid, mixtures of phosphoric acid and phosphorus pentoxide, phosphorus oxychloride.
• genes with this vinylsulfonyl group can in a conventional manner by reaction with a dialkylamine with alkyl radicals of 1 to 4 carbon atoms each in the corresponding compounds of the general formula (1) according to the invention with X a radical of the formula (3) , where Z stands for the corresponding dialkylamino group, or by reaction with an alkali salt of thiosulfuric acid, such as sodium thiosulfate, in the dye according to the invention of the general formula (1) with X the rest of the formula (3), in which Z is the thiosulfato group .
• the copper complex compounds according to the invention are produced from the compounds of the general formula (1) using a copper-donating agent by a dealkylating copper reaction, provided that K is a hydroxyl or amino group ortho-constant to the azo group.
• the dealkylative coppering reaction takes place in a manner known per se, such as in Houben-Weyl, methods of org. Chemie, Volume 10/3 (1965), p. 455.
• the copper complex compounds according to the invention can subsequently be changed in a corresponding manner in the formula radical X.
• suitable copper-donating compounds are the simple and complex salts of copper, such as copper sulfate, copper chloride, copper acetate or copper carbonate and the copper salts of salicylic acid or tartaric acid.
• K is a radical of the following formulas (7a), (7b), (7c), (7d), (7e), (7f), ( 7g), (7h), (7i), (7j) (7k), (7m), (7n), (7p), (7q) or (7r) means:
• the expression “lower” means that the alkyl or alkylene radical or alkenyl radical contained in the group preferably consists of 1 to 4 carbon atoms.
• Azo compounds of the general formula (4) can be emphasized, for example, those in which the formula radical K and the radical Y attached thereto are a radical of the general formulas (8a), (8b), (8c), (8d), (8e) mentioned below. , (8f) or (8g) means:
• R ', R 1 , R 2 , R 3 , R 4 , B, B 1 , B 2 , D * , n', m and m 1 have the meanings given initially, the complex-forming oxygen atoms or amino groups in each case are bonded ortho to the azo groups, and R 5 * denotes a hydrogen atom or has the above meaning of .
• Coupling components of the general formulas (6) and (6a) which can be used to prepare the dyes of the general formula (1) according to the invention are in particular, for example, the compounds of the general formulas (9a), (9b), (9c), (9d ), (9e), (9f), (9h), (9i), (9j), (9k), (9m), (9n), (9p) and (9q): in which D *, R ', R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 6 , R 7 , R 8 , R 9 , R ", R5, R5', R *, k, m, m i , n ', B, B i , B 2 , B 3 and B 4 have the meanings given above.
• Coupling components of the general formulas (6) and (6a) which contain a hydroxyl or amino group capable of forming copper complexes and which can be used to prepare the copper complex compounds according to the invention are, in particular, for example, the abovementioned compounds of the general formulas (9a), (9b), ( 9c), (9d), (9e), (9f), (9h), (9p) and (9q).
• Coupling components of the general formulas (6) and (6a) which can be used to prepare the dyes according to the invention and, for example, correspond to the general formulas (7a) to (7q), are, for example: 1,3-diaminobenzene-5-sulfonic acid, phenol, Cresol, resorcinol, 2 - ethoxyphenol, 4-methylphenol, 3-sulfophenol, salicylic acid, 3-sulfonaphthol, 4-sulfonaphthol, 5-sulfonaphthol, 3,6-disulfonaphthol (8), 4,6-disulfonaphthol ( 8), 1-naphthol-3,8-disulfonic acid, 1-aminonaphthol (8) -4-sulfonic acid, 1-aminonaphthol (8) -5-sulfonic acid, 1-amino-8-naphthol-2,4-disulfonic acid
• the compounds according to the invention can be isolated from their synthesis solutions by generally known methods for water-soluble compounds, for example by precipitation from the reaction medium by means of an electrolyte, such as sodium chloride or potassium chloride, or by evaporation of the reaction solution itself, for example by spray drying. If If the latter type of isolation of the compounds according to the invention is chosen, it is often advisable to remove any amounts of sulfate present in the solutions by evaporation as calcium sulfate and separation by filtration before evaporation. In some cases, the aqueous solution of the compound according to the invention, optionally after adding a buffer substance, can also be used directly as a liquid preparation, for example for dyeing or printing a fiber material.
• the metal-free and copper complex compounds according to the invention have valuable dye properties.
• the fiber-reactive residue in the compounds according to the invention has the property of forming a covalent bond with the NH and OH groups - preferably with the hydroxyl groups in the alkaline range - and thus creating a genuine bond with the fiber.
• the present invention thus also relates to the use of the compounds according to the invention for dyeing (including printing) materials made from natural, regenerated or synthetic nitrogen-containing fibers or from natural, regenerated or synthetic hydroxyl-containing fibers or from leather or to a process for dyeing (including printing) from materials (substrates) in which a compound according to the invention, preferably from an aqueous solution, is applied to the substrate and, if appropriate under the action of an alkali and heat, is fixed on the substrate.
• Nitrogen-containing fiber materials are e.g. B. fibers made of synthetic polyurethanes or polyamides, such as polyamide-6.6, polyamide-6, polyamide-11 and polyamide-4, natural fiber materials made of polyamides are silk and wool and other animal hair.
• Fiber materials containing hydroxyl groups are, in particular, cellulose fiber materials, preferably cotton and other vegetable fibers, such as linen, hemp, jute, and also the corresponding fibers made from regenerated cellulose, such as, for example, viscose or copper silk.
• the compounds according to the invention can be applied to the substrates mentioned by the application techniques which are generally known for fiber-reactive dyes.
• the general procedure is that the compounds according to the invention are applied to the substrate in aqueous solution, if appropriate in the presence of a customary thickener and / or if appropriate other auxiliaries which can improve, for example, the absorbency, leveling and migration properties, the aqueous solution of the compound according to the invention can be adjusted to be slightly acidic, neutral or alkaline.
• the compounds according to the invention are applied in a conventional manner from an aqueous weakly acidic to aqueous neutral solution (pH range between about 3 and 6.5), preferably according to the methods of the exhaust process Fiber applied and fixed there in the heat, especially at a temperature between 60 and 130 ° C.
• aqueous weakly acidic to aqueous neutral solution pH range between about 3 and 6.5
• acetic acid or acetic acid and ammonium acetate can be added to the bath containing the compound according to the invention as a buffer in order to obtain the desired pH.
• conventional leveling agents for example based on a reaction product of cyanuric chloride with three times the molar amount of an aminobenzenesulfonic acid and / or an aminonaphthalenesulfonic acid and / or on the basis of a reaction product of stearylamine with ethylene oxide.
• the application and fixing of the compound according to the invention on the substrate can be carried out in accordance with the exhaust process both at boiling temperature and at a higher temperature, for example at 105 to 120 ° C., under pressure, the dyeing expediently being carried out with a slow increase in temperature to 60 ° C. , after some time while slowly increasing the temperature to a higher temperature, begins.
• the compound according to the invention is generally applied to the fiber from neutral to alkaline solution and fixed thereon in the presence of an alkaline agent which, if necessary, is subsequently added to the aqueous solution or applied to the fiber.
• Alkaline substances that can be used in these fixing solutions are, for example, sodium hydroxide, sodium carbonate, sodium hydrogen carbonate, potassium hydroxide, potassium carbonate, disodium hydrogen phosphate, trisodium phosphate or sodium or potassium silicate (water glass).
• the thus alkaline-treated goods are then either deposited at a temperature between 20 and 50 ° C (for example, they are laid down or wrapped on a blanket) and left there for several hours to fix the compound according to the invention, or subsequently to fix the compound according to the invention under the action of moist or dry heat (for example using hot steam, hot air or infrared radiation).
• moist or dry heat for example using hot steam, hot air or infrared radiation.
• the alkaline agents can also be added to the aqueous dye solution.
• the fiber material is treated in the aqueous alkaline solution which contains the compound according to the invention, advantageously with the addition of an electrolyte, such as sodium chloride or sodium sulfate, at relatively high temperatures, for example at a temperature between 30 and 110 ° C., advantageously with the temperature of the pull-out bath slowly increasing to 60 ° C., the treatment of the fiber begins and the fixing then continues and ends at temperatures up to 110 ° C.
• an electrolyte such as sodium chloride or sodium sulfate
• pretreat the cellulose fiber with a solution of an alkaline compound, then, if necessary after intermediate drying, impregnate with the aqueous solution of the compound according to the invention and then fix the fiber-reactive compound thereon at room temperature, but preferably with heat treatment.
• thickeners such as sodium alginate, locust bean gum ether, cellulose ether, tragacanth or gum arabic are usually used, optionally with the addition of a customary printing aid and the above-mentioned alkaline compounds. These pressures are then treated with hot air (heat-set) or steamed at a temperature between 70 and 230 ° C, preferably between 100 and 150 ° C.
• the compounds according to the invention can be applied to the cellulose fiber using the printing paste in a single phase in the presence of sodium bicarbonate or another of the alkaline agents mentioned above, and the compound according to the invention can then be fixed by steaming at 101 to 103 ° C., or else using a two-phase process are first applied to the fiber with neutral or weakly acidic printing paste, whereupon they are fixed on the fiber either by passing the printed material through a hot electrolyte-containing alkaline bath or by padding with an alkaline electrolyte-containing liquor and then lingering or heat treatment.
• an electrolyte-containing alkaline bath through which the material impregnated with the compound according to the invention is passed for fixation, a temperature of 60 to 105 ° C. is used for the bath, so that a subsequent treatment by hot air or steam can be dispensed with.
• a strong aqueous alkali such as e.g. Sodium or potassium hydroxide or sodium or potassium silicate or trisodium phosphate, it suffices to fix the compounds according to the invention for a longer period of time for the moist, alkaline-impregnated product, preferably the prints, at room temperature.
• the colored materials obtained in this way are then aftertreated, rinsed and dried in the customary manner.
• the dyeings or prints obtained in this way with the compounds according to the invention show excellent wet fastness properties; Of these, the soda-boiling fastness, the washing fastness at 60 and 95 ° C, the peroxide washing fastness, such as at 95 ° C, the alkaline and acidic sweat-fastness, the fastness to water (difficult), the fastness to chlorine bleach and the fastness to chlorine are particularly worth mentioning.
• the lightfastness of the dyeings produced with the copper complex compounds of the general formula (4) is remarkably good when the substrate is dry and moist.
• the good lightfastness is maintained even with synthetic resin finishing of the dyeings on cellulose fibers; there is no deterioration in the nuance.
• the prints obtained with the dyes according to the invention moreover show a high definition and a very high purity of the white fund.
• the metal-free and copper complex compounds according to the invention generally have a very good ability to absorb and build up and a high degree of fixation. They fix on the different fiber materials of a cotton / cellulose blended fabric with the same intensity; so they show the same nuance and color strength on these fiber materials.
• a neutral solution of 34.6 parts of 2-methoxy-5-chloro-4- (ß-sulfatoäthyisulfonyl) aniline in 200 parts of water is mixed with 7 parts of sodium nitrite; this solution is poured into a mixture of 35 parts of concentrated hydrochloric acid and 100 parts of ice with thorough stirring. The mixture is stirred for a further 30 minutes and then the excess nitrite is removed with amidosuifonic acid. 36.1 parts of 1-acetylamino-8-naphthol-3,6-disulfonic acid are introduced into this suspension of the diazonium salt and the pH of the coupling mixture is gradually adjusted to 6 over the course of about 1 hour.
• the mixture is stirred until the coupling is complete after, the azo compound formed precipitates with potassium chloride and isolates it by suction or evaporation (for example spray drying) of the solution after the solution has been clarified, if appropriate.
• a blue-red powder is obtained which, in addition to the electrolyte (predominantly potassium chloride), the alkali metal salt, predominantly potassium salt, of the compound of the formula contains.
• This compound is excellently suitable as a dye for dyeing cellulose fibers and native and synthetic polyamide fibers, such as cotton, rayon, linen, wool, polyamide-6 and polyamide-6,6.
• cellulose fiber materials In particular on cellulose fiber materials, it delivers deep-colored prints and dyeings of burgundy shades and very good wet fastnesses, such as very good wash fastness at temperatures between 40 and 95 ° C, peroxide wash fastness, water fastness (difficult), alkaline and according to the usual procedures for application and fixation for reactive dyes acid fastness to perspiration and chlorine bathing water, as well as good flue gas fastness and good light fastness on dry and moist fiber material. Resin finishing of the dyed fiber material does not affect the shade or the lightfastness of the dyeing.
• the prints obtainable with the dye according to the invention show high definition and a pure white background. The dye shows a very good build-up.
• This copper complex compound is excellently suitable as a dye for dyeing cellulose fiber materials, native and synthetic polyamide fiber materials such as cotton, rayon, linen, wool and polyamide-6, and provides violet dyeings on these fiber materials, in particular on the cellulose fiber materials, according to the procedures customary for reactive dyes or prints with very good wash fastness at 40 - 95 ° C, very good peroxide wash fastness, water fastness (heavy), alkaline and acidic sweat fastness, chlorine bath water fastness and exhaust gas fastness.
• the drawability of this copper complex dye and its color structure as well as the lightfastness of its dyeings on dry and moist fiber material are excellent.
• a neutral solution of the azo compound of Example 3 is mixed with the equivalent amount of copper (11) -hydroxycarbonate and adjusted to a pH of 4.5 with sodium acetate and acetic acid. This mixture is heated to boiling for 3 to 6 hours while maintaining this pH using the sodium acetate / glacial acetic acid buffer. The hot reaction mixture is then clarified and the filtrate is evaporated to dryness. A salt-containing, blue-black powder is obtained, which is the alkali salt of the compound of the formula contains. This compound shows very good dye properties and provides dyeings and prints with good application properties and fastness properties in an analogous manner to that described for the dye of Example 1.
• the azo compound obtained is deposited by adding a little sodium chloride; a powder is obtained which, in addition to a small amount of electrolyte (sodium chloride), contains the sodium salt of the compound of the formula contains.
• 103 parts of this azo compound are dissolved in 100 parts of concentrated sulfuric acid at 20 to 25 ° C with stirring. after the solution is complete, the reaction mixture is poured onto a mixture of 500 parts of ice and water, the compound is salted out with sodium chloride and suction filtered. The moist filter cake is suspended in 400 parts of water, the pH is adjusted to 5 using sodium carbonate, the solution is clarified and evaporated to dryness (for example by spray drying). An electrolyte-containing powder with the sodium salt of the compound of the formula is obtained
• This azo compound with the sulfatoethylsulfonyl group is a very good fiber-reactive dye that dyes materials made of cellulose fibers, synthetic and native polyamide fibers, such as cotton, linen, wool, silk, polyamide-6, in bright scarlet shades. Its dyeings and prints have the good to very good fastness to manufacture and use mentioned in Example 1.
• An aqueous solution of the ⁇ -sulfatoethylsulfonyl azo compound of Example 5 is adjusted to a pH of 11-12 with concentrated sodium hydroxide solution and stirred at a temperature of 20 ° C. for 30 minutes while maintaining this pH.
• the pH is then brought back to 6 by acid and the azo compound is isolated by salting out with sodium chloride. It is suctioned off and dried at 80-100 ° C.
• the obtained electrolyte powder with the alkali metal salt (sodium salt) of the compound of the formula has very good dye properties. With it, dyeings and prints, in particular according to the application and fixing methods customary for reactive dyes on cellulose fiber material, are obtained with the good application properties and fastness properties mentioned for the dyes according to the invention.
• An aqueous solution of the vinylsulfonyl azo compound of Example 6 with a pH of 6 is mixed with the equivalent amount of diethylamine; this reaction solution is stirred at 20 to 25 ° C for several hours.
• a pH of 5-6 is then set with aqueous hydrochloric acid and the azo compound is salted out with sodium chloride. After about 3 hours, the precipitated compound is suctioned off and dried under reduced pressure.
• An electrolyte-containing powder with the alkali salt (sodium salt) of the compound of the formula is obtained which also shows very good dye properties and provides dyeings and prints in a bright scarlet red with the fastness properties mentioned in Example 5.
• the electrolyte- and alkali-containing padding liquors and printing pastes of this dye show a high durability.
• This also has good dye properties and dyes cellulose fiber materials and native polyamide fiber materials according to the usual dyeing methods, as are described in particular for dyes with a ⁇ -thiosulfatoethylsulfonyl group, in the good fastness properties described for the dye of Example 5.
• the alkali salt of the compound of the formula is obtained which shows very good dye properties and dyes cellulose fiber materials and polyamide fiber materials in scarlet tones according to the application methods customary for reactive dyes. It has the same excellent manufacturing and usage fastnesses as the ⁇ -sulfatoethylsulfonyl dye described in Example 5.
• the salt and alkali-containing padding liquors and printing pastes of this phosphato compound show a high durability.
• this compound provides strong color printing and dyeings of a clear reddish yellow shade with the very good manufacturing and usage fastness properties mentioned for the dye of Example 1 on cellulose and polyamide fiber material; it also shows a very good color structure.
• a black-brown electrolyte-containing powder with the fiber-reactive copper complex compound of the formula is obtained (as alkali salt), which has good dye properties and, for example, provides strong dyeings and prints of a yellowish brown on cotton and very good manufacturing and use fastnesses, of which the excellent lightfastness on dry and moist fiber material, including those with synthetic resin finishing, is particularly noteworthy .
• the azo compounds of the general formula (1) according to the invention characterized in the following table examples by their diazo and coupling components or their copper complexes of the general formula (4) can also be prepared according to the invention, for example according to the procedures of the above exemplary embodiments, by reacting the diazonium compound Produce said amine according to the general formula (5) with the coupling component according to the general formula (6) and optionally by subsequent dealkylating copper reaction.
• These fiber-reactive azo compounds or their copper complex compounds according to the invention have very good dye properties and provide dyeings and prints on the fiber materials mentioned in the description, in particular on cellulose fiber materials by the application and fixing methods customary for fiber-reactive dyes, with very good application properties and fastness properties.
• This disazo compound is very suitable as a dye; it dyes, in particular according to customary methods of application and fixation for reactive dyes, on cellulose fiber materials and also on polyamide fiber materials, deep, greenish black dyeings and prints with good fastness properties, such as good wash fastness at 40-95 ° C., good peroxide wash fastness, water fastness (difficult) , alkaline and acidic perspiration fastness, chlorine bath water fastness, exhaust gas fastness, good light fastness on dry and moist fiber material.
• good fastness properties such as good wash fastness at 40-95 ° C., good peroxide wash fastness, water fastness (difficult) , alkaline and acidic perspiration fastness, chlorine bath water fastness, exhaust gas fastness, good light fastness on dry and moist fiber material.
• a diazonium salt suspension is prepared according to the instructions in Example 10 from 18 parts of 2-ethoxy-5-chloro-4- ( ⁇ -sulfatoethylsulfonyl) aniline and mixed with 14.4 parts of 1-amino-8-naphthol-6-disulfonic acid; the coupling mixture is stirred in the acidic medium for a further 5-6 hours.
• the diazonium salt solution is then prepared in a conventional manner from 8.7 parts of 1-aminobenzene-2-sulfonic acid, this is poured into the solution of the monoazo compound prepared and the second coupling is carried out after setting a pH of 5-6 and maintaining this pH with stirring for several hours.
• the disazo compound obtained in this way can be isolated in the usual way (by salting out or spray drying the previously clarified solution).
• An electrolyte-containing black powder is obtained, which is the alkali metal salt of the compound of the formula contains.
• This disazo compound is very suitable as a dye for dyeing cellulose fiber materials and materials made from native and synthetic polyamide fibers. According to the application and fixing processes customary for fiber-reactive dyes, this dye provides prints and dyeings in strong, greenish black shades with very good fastness properties, as mentioned, for example, in the present description or in Example 1.
• a neutral solution of 30.3 parts of 2-naphthylamine-4,8-disulfonic acid in 250 parts of water is mixed with 70 parts of a concentrated aqueous hydrochloric acid and 100 parts of ice.
• 14 parts of an aqueous 40% sodium nitrite solution are poured in with stirring and the mixture is then stirred for another hour; Excess nitrite is removed with amidosulfonic acid.
• 11.2 parts of resorcinol are added and the coupling mixture is stirred in an acidic medium for 6 to 8 hours at 10 25 ° C., the temperature is then increased to 45 ° C. and the mixture is stirred for a further 4 to 6 hours at this temperature.
• reaction mixture is then adjusted to a pH of 6-7 with about 250 parts of concentrated sodium hydroxide solution.
• An acidic diazonium salt suspension prepared according to Example 1 from 34.6 parts of 2-methoxy-5-chloro-4- ( ⁇ -sulfatoethylsulfonyl) aniline is added to the solution of the azo compound which has just been prepared and cooled to 0 to 10 ° C.
• the pH is adjusted to 6-7 to carry out the second coupling reaction with sodium carbonate and stirring is continued for 10 hours until no more diazonium salt can be detected.
• This copper complex disazo compound is very suitable as a dye and provides strong dyeings and prints of reddish brown shade and good to very good manufacturing and usage fastnesses on fiber materials made of cellulose, native and synthetic polyamides using the dyeing methods customary for fiber-reactive dyes.

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• 1979
  • 1979-12-19 DE DE19792951061 patent/DE2951061A1/de not_active Withdrawn
• 1980
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